Rob Biernacki demonstrates ‘FYJJ Kimura Sparring’, an important training method for developing any submission. Here you treat the submission as a hub position when you’re rolling, maintaining it, transitioning from it, and returning to it when you go off track. This training method is fully explained (with many more examples) in The Submission Formula which you can find out more about at https://www.grapplearts.com/submissionformula